Regarding 6...e5, it's a second rate move - quite clearly, it's/was used regularly by several GMs, most notably Epishin and Baklan, both played it as a rule against the lower lever opponents (for the record, personally against me Epishin played the Kan System the last time and Baklan played the French Defence).

Mega Database has 4 (four) games in this line, including one rapid, with both opponents rated 2500 or higher. For comparison, there are more than 50 such games with 6...Bd7, which is also not a main line.

On the other hand, it would have been useful to know that some White players dislike 6...e5 most in the position after 6.Bc4, it would have inspired me to examine it in more detail.

In his new book Golubev simply says "Probably White has some edge after the aggressive 7.Nf5, meeting 7...Be6!? by 8.Qd3." The book consists of his own games, and no-one has ever played 6...e5 against him. A bit disappointing, since his coverage of the Bc4 stuff is a major reason to buy the book.

My engine also likes 8.Qd3; I started looking at 8..g6 9.Ne3 and 8..Qd7 9.Ne3, but it seems pretty easy for White to get in Nd5 under favorable conditions. In the one game I found with 8.Qd3, Black tried 8..Nb4 and 10..d5, but that didn't work out so well.

In his book, Golubev also looked briefly at 7.Nde2 and 7.Nf3, concluding that White keeps an edge. I'll post the lines when I can, but one idea was a4 and b3, keeping the Bc4 where it is and not automatically playing Bb3 in response to ..Be6.

Apparently you're thinking of something else; this is what he gave on those moves:

In his new book Golubev simply says "Probably White has some edge after the aggressive 7.Nf5, meeting 7...Be6!? by 8.Qd3." The book consists of his own games, and no-one has ever played 6...e5 against him. A bit disappointing, since his coverage of the Bc4 stuff is a major reason to buy the book.

In his book, Golubev also looked briefly at 7.Nde2 and 7.Nf3, concluding that White keeps an edge. I'll post the lines when I can, but one idea was a4 and b3, keeping the Bc4 where it is and not automatically playing Bb3 in response to ..Be6.

Apparently you're thinking of something else; this is what he gave on those moves:

I looked into this a little, and it is surprisingly difficult to find something good against 6..e5. In his old Sozin book, Golubev noted that 7.Nf5 wasn't convincing and, IIRC, gave a line beginning with 7..Bxf5. The lines with ..Be6 also look pretty solid.

In his book, Golubev also looked briefly at 7.Nde2 and 7.Nf3, concluding that White keeps an edge. I'll post the lines when I can, but one idea was a4 and b3, keeping the Bc4 where it is and not automatically playing Bb3 in response to ..Be6.

"Modernized: The Open Sicilian" advocated the Sozin against the Classical, with the old short-castling main line. One thing to note is that if White is happy with that, he can play 7. 0-0 instead of 7. Bb3 in the Najdorf version (still allowing the ...b5 line, but devaluing ...Nbd7, which is perhaps more challenging).

I analysed some of the Sozin lines given in that book, but wasn't convinced by the following recommendation: 1.e4 c5 2.Nf3 Nc6 3.Bc4 d6 4.d4 cxd4 5.Nxd4 Nf6 6.Nc3 e5 7.Nf5

To be honest this 6...e5 line put me off using the Sozin as a regular weapon against the Classical. Indeed I'm still not sure what White's most promising try is after 6...e5.

The man who tries to do something and fails is infinitely better than he who tries to do nothing and succeeds - Lloyd Jones

I understood kylemeister to be saying that White must be happy with the 0-0 line in the Sozin (recommended by Amanov and Kavutskiy) in order to play 6.Bc4 e6 7.0-0 against the Najdorf, because Black can transpose into that Sozin line - not that White can force the transposition even if Black doesn't want it.

Incidentally the line given by MNb stuck in my memory as associated with a game Chandler-Rachels, and considered equal in Golubev's Sozin book of some time ago. I see that the Modernized book also has 9. f4 Bd7 10. Qe2, which Golubev described as having hardly been investigated.